Optical films having reverse dispersion

Abstract

This invention relates to an optical film comprising a first component having a birefringence dispersion of D 1 >1 and a second component having a birefringence dispersion of D 2 <1, wherein the birefringence ratio of the first and second component is delta n 1 /delta n 2 >0, wherein the optical film has a reverse birefringence dispersion of D<1.

1. An optical film comprising a first component having a birefringence dispersion of D 1 >1 and a second component having a birefringence dispersion of D 2 <1, wherein the birefringence ratio of the first and second component is delta n 1 /delta n 2 >0, and wherein the optical film has a reverse birefringence dispersion of D<1. 
   
   
     2. The optical film of  claim 1  wherein the optical film has a reverse birefringence dispersion of D<0.98. 
   
   
     3. The optical film of  claim 1  wherein the first component is a polymer. 
   
   
     4. The optical film of  claim 3  wherein the second component has a maximum peak absorption at a wavelength greater than 700 nm. 
   
   
     5. The optical film of  claim 4  wherein the second component has a molecular weight of less than 2000. 
   
   
     6. The optical film of  claim 5  wherein the second component is an organic component. 
   
   
     7. The optical film of  claim 6 , wherein the organic component is an IR-ray absorbing or IR dye. 
   
   
     8. The optical film of  claim 3  wherein the second component is covalently attached to the polymer. 
   
   
     9. The optical film of  claim 8  wherein the second component has a maximum peak absorption at a wavelength greater than 700 nm. 
   
   
     10. The optical film of  claim 3  wherein the polymer is transparent in the visible range. 
   
   
     11. The optical film of  claim 3  wherein the polymer is a vinyl polymer or a condensation polymer. 
   
   
     12. The optical film of  claim 3  wherein the polymer is polymethylmethacrylate. 
   
   
     13. The optical film of  claim 1  wherein the first component has a birefringence dispersion of D 1 <1.05. 
   
   
     14. The optical film of  claim 1  wherein the second component has a birefringence dispersion of D 2 <0.9. 
   
   
     15. The optical film of  claim 1 , wherein said film is a retardance film. 
   
   
     16. The optical film of  claim 1  wherein the in-plane retardation of 20 the film is from 0 to 300 nm. 
   
   
     17. The optical film of  claim 1  wherein the in-plane retardation of the film is from 20 to 200 nm. 
   
   
     18. The optical film of  claim 1  wherein the in-plane retardation of the film is from 25 to 100 nm. 
   
   
     19. The optical film of  claim 1  wherein the out-of-plane retardation of the film is from −300 to +300 nm. 
   
   
     20. The optical film of  claim 1  wherein the out-of-plane retardation of the film is from −200 to +200 nm. 
   
   
     21. The optical film of  claim 1  wherein the out-of-plane 5 retardation of the film is from −100 to +100 nm. 
   
   
     22. The optical film of  claim 1  wherein the optical film has a reverse birefringence dispersion of D<0.9. 
   
   
     23. An LCD polarizer film composite comprising a polarizer and an optical film comprising a first component having a birefringence dispersion of D 1 >1 and a second component having a birefringence dispersion of D 2 <1, wherein the birefringence ratio of the first and second component is delta n 1 /delta n 2 >0, and wherein the optical film has a reverse birefringence dispersion. 
   
   
     24. A method of making an optical film comprising mixing a first component having a birefringence dispersion of D 1 >1 and a second component having a birefringence dispersion of D 2 <1 and forming a film from the resulting mixture, wherein the birefringence ratio of the first and second component is delta n 1 /delta n 2 >0, and wherein the optical film has a reverse birefringence dispersion. 
   
   
     25. The method of  claim 24  a further comprising reacting the first component and the second component to form covalent bonds.